In an alarming close call, a Delta flight aborted landing at Boston's Logan Airport as it could have collided with another plane taking off. It comes as air traffic control shortages hit critical levels due to the government shutdown. Matt Rivers reports. https://abcnews.go.com/?utm_source=facebook&utm_medium=social&utm_campaign=dhfacebook&utm_content=app.dashsocial.com/abcworldnewstonight/library/media/600850335 | ABC World News Tonight with David Muir